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    <meta charset="UTF-8">
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    <title>Document</title>
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<body>
    <script>
        let score = [];
        score.length = 5;
        let max  = 0,min = Infinity,sum = 0;
        alert('请输入小明的各科成绩：');
        for(let i = 0;i < 5;++i){
            score[i] = parseInt(prompt());
            sum += score[i];
            max = Math.max(max,score[i]);
            min = Math.min(min,score[i]);
        }

        document.write('5门成绩分别是：'+score[0]+','+score[1]+','+score[2]+","+score[3]+','+score[4]);
        document.write('<br>');
        document.write('总分是：'+sum+'<br>');
        document.write('平均分：'+sum/5+'<br>');
        document.write('最高分：'+max+'<br>');
        document.write('最低分：'+min+'<br>');
    </script>
</body>
</html>